curl --request POST \
  --url https://api.sumvin.com/v0/cards/{card_id}/unfreeze

{
  "_links": {},
  "id": "<string>",
  "last_four": "<string>",
  "brand": "<string>",
  "card_type": "<string>",
  "is_primary": true,
  "created_at": 123,
  "previous_status": {
    "status": "<string>",
    "sub_status": "<string>",
    "changed_by": "<string>",
    "created_at": 123
  },
  "current_status": {
    "status": "<string>",
    "sub_status": "<string>",
    "changed_by": "<string>",
    "created_at": 123
  },
  "action": "<string>"
}